{"title":"具有微胶囊可膨胀石墨和微胶囊红磷的阻燃增强型乙烯-醋酸乙烯共聚物","authors":"","doi":"10.1016/j.polymdegradstab.2024.110984","DOIUrl":null,"url":null,"abstract":"<div><p>Simultaneously elevating fire safety and mechanical property is of great significance in flame retardation of polymers. Herein, a series of ethylene vinyl acetate (EVA) composites flame-retarded by expandable graphite (EG) were prepared and studied respecting their fire-retardant, mechanical, rheological and electrical properties. Results evince that combination of microencapsulated expandable graphite/microencapsulated red phosphorus (MEG/MRP) shows efficient fire-retarding effect on EVA in that adding merely 8 wt.% MEG/MRP can raise the polymer's limiting oxygen index to 26.6 % and UL-94 test to V-0 rating, whereas up to 20 wt.% EG and 10 wt.% EG/MRP are required for EVA to attain V-0 rating, respectively. The high efficiency is caused by more sizeable expansion ratio of MEG and high-quality expanded char resulting from MEG/MRP. Proper crosslinking of EVA matrix can augment strength and elasticity of EVA/MEG/MRP composite without lowering its fire retardance. Overall, the crosslinked EVA/MEG/MRP composite with 8 wt.% MEG/MRP shows good fire safety and mechanical property concurrently in contrast with virgin EVA.</p></div>","PeriodicalId":406,"journal":{"name":"Polymer Degradation and Stability","volume":null,"pages":null},"PeriodicalIF":6.3000,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Flame-retarded and reinforced ethylene vinyl acetate copolymer with microencapsulated expandable graphite and microencapsulated red phosphorus\",\"authors\":\"\",\"doi\":\"10.1016/j.polymdegradstab.2024.110984\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Simultaneously elevating fire safety and mechanical property is of great significance in flame retardation of polymers. Herein, a series of ethylene vinyl acetate (EVA) composites flame-retarded by expandable graphite (EG) were prepared and studied respecting their fire-retardant, mechanical, rheological and electrical properties. Results evince that combination of microencapsulated expandable graphite/microencapsulated red phosphorus (MEG/MRP) shows efficient fire-retarding effect on EVA in that adding merely 8 wt.% MEG/MRP can raise the polymer's limiting oxygen index to 26.6 % and UL-94 test to V-0 rating, whereas up to 20 wt.% EG and 10 wt.% EG/MRP are required for EVA to attain V-0 rating, respectively. The high efficiency is caused by more sizeable expansion ratio of MEG and high-quality expanded char resulting from MEG/MRP. Proper crosslinking of EVA matrix can augment strength and elasticity of EVA/MEG/MRP composite without lowering its fire retardance. Overall, the crosslinked EVA/MEG/MRP composite with 8 wt.% MEG/MRP shows good fire safety and mechanical property concurrently in contrast with virgin EVA.</p></div>\",\"PeriodicalId\":406,\"journal\":{\"name\":\"Polymer Degradation and Stability\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":6.3000,\"publicationDate\":\"2024-08-30\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Polymer Degradation and Stability\",\"FirstCategoryId\":\"92\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S0141391024003288\",\"RegionNum\":2,\"RegionCategory\":\"化学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"POLYMER SCIENCE\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Polymer Degradation and Stability","FirstCategoryId":"92","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0141391024003288","RegionNum":2,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"POLYMER SCIENCE","Score":null,"Total":0}
引用次数: 0
摘要
同时提高防火安全性和机械性能对聚合物阻燃具有重要意义。本文制备了一系列由可膨胀石墨(EG)阻燃的乙烯-醋酸乙烯(EVA)复合材料,并研究了它们的阻燃、机械、流变和电气性能。结果表明,微胶囊可膨胀石墨/微胶囊红磷(MEG/MRP)的组合对 EVA 具有高效的阻燃效果,只需添加 8 wt.% 的 MEG/MRP,就能将聚合物的极限氧指数提高到 26.6 %,UL-94 测试达到 V-0 级,而 EVA 要达到 V-0 级则分别需要高达 20 wt.% 的 EG 和 10 wt.% 的 EG/MRP。效率高的原因是 MEG 的膨胀率更大,MEG/MRP 产生的膨胀炭质量更高。EVA 基体的适当交联可增强 EVA/MEG/MRP 复合材料的强度和弹性,同时不会降低其阻燃性。总体而言,与原始 EVA 相比,含 8 wt.% MEG/MRP 的交联 EVA/MEG/MRP 复合材料同时具有良好的防火安全性和机械性能。
Flame-retarded and reinforced ethylene vinyl acetate copolymer with microencapsulated expandable graphite and microencapsulated red phosphorus
Simultaneously elevating fire safety and mechanical property is of great significance in flame retardation of polymers. Herein, a series of ethylene vinyl acetate (EVA) composites flame-retarded by expandable graphite (EG) were prepared and studied respecting their fire-retardant, mechanical, rheological and electrical properties. Results evince that combination of microencapsulated expandable graphite/microencapsulated red phosphorus (MEG/MRP) shows efficient fire-retarding effect on EVA in that adding merely 8 wt.% MEG/MRP can raise the polymer's limiting oxygen index to 26.6 % and UL-94 test to V-0 rating, whereas up to 20 wt.% EG and 10 wt.% EG/MRP are required for EVA to attain V-0 rating, respectively. The high efficiency is caused by more sizeable expansion ratio of MEG and high-quality expanded char resulting from MEG/MRP. Proper crosslinking of EVA matrix can augment strength and elasticity of EVA/MEG/MRP composite without lowering its fire retardance. Overall, the crosslinked EVA/MEG/MRP composite with 8 wt.% MEG/MRP shows good fire safety and mechanical property concurrently in contrast with virgin EVA.
期刊介绍:
Polymer Degradation and Stability deals with the degradation reactions and their control which are a major preoccupation of practitioners of the many and diverse aspects of modern polymer technology.
Deteriorative reactions occur during processing, when polymers are subjected to heat, oxygen and mechanical stress, and during the useful life of the materials when oxygen and sunlight are the most important degradative agencies. In more specialised applications, degradation may be induced by high energy radiation, ozone, atmospheric pollutants, mechanical stress, biological action, hydrolysis and many other influences. The mechanisms of these reactions and stabilisation processes must be understood if the technology and application of polymers are to continue to advance. The reporting of investigations of this kind is therefore a major function of this journal.
However there are also new developments in polymer technology in which degradation processes find positive applications. For example, photodegradable plastics are now available, the recycling of polymeric products will become increasingly important, degradation and combustion studies are involved in the definition of the fire hazards which are associated with polymeric materials and the microelectronics industry is vitally dependent upon polymer degradation in the manufacture of its circuitry. Polymer properties may also be improved by processes like curing and grafting, the chemistry of which can be closely related to that which causes physical deterioration in other circumstances.